Abstract
Efficient solar water photosplitting is plagued by large overpotentials of the HER and OER. Even with a noble metal catalyst, the hydrogen evolution reaction can be limited by the strong M–H bonding over some metals, such as Pt, Pd, and Rh, inhibiting hydrogen desorption. H absorption is regulated by the potential at the metal nanoparticles. Through controlled periodic illumination of a Pt/TiO2 suspension, we hypothesized a fast variation of the photopotential that induced catalytic surface resonance on the metal, resulting in more than a 50% increase of the efficiency at frequencies higher than 80 Hz.
Highlights
Efficient solar water photosplitting is plagued by large overpotentials of the Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER)
Another investigated strategy in the field of TiO2 photocatalysis to enhance quantum yield of the photocatalytic process consists of employing a temporal modulation of the light source, i.e., Controlled Periodic Illumination (CPI).[16,17]
Our research group recently published a paper in which it demonstrated that CPI is unable to increase the quantum yield of the photocatalytic process for pollutant abatement on a bare TiO2 suspension.[18]
Summary
Efficient solar water photosplitting is plagued by large overpotentials of the HER and OER. To assess the influence of the CPI technique on the rate of H2 production, we perform three CPI experiments (f = 0.8 Hz, f = 80 Hz, and f = 8 kHz, with ICPI = 100 W m−2 and γ = 0.2) and a continuous illumination experiment at an irradiance of I0 = 20 W m−2; in this way, we compared measurements with the same average incident irradiance over the entire irradiation experiment (see SI Figure S3).
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